CN1983411A - Optical pickup device - Google Patents
Optical pickup device Download PDFInfo
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- CN1983411A CN1983411A CNA2006101642843A CN200610164284A CN1983411A CN 1983411 A CN1983411 A CN 1983411A CN A2006101642843 A CNA2006101642843 A CN A2006101642843A CN 200610164284 A CN200610164284 A CN 200610164284A CN 1983411 A CN1983411 A CN 1983411A
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- spherical aberration
- zone
- light beam
- liquid crystal
- voltage
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
- G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
Abstract
The invention relates to an optical pickup device which includes a liquid crystal element having transparent electrodes, one of which has a plurality of areas divided in a concentric manner. The liquid crystal element can compensate for a spherical aberration that is generated when information is reproduced or recorded on two types of optical recording media. When one of two light beams supporting the two types of optical recording media having a larger value of an effective diameter is a first light beam and the other having a smaller value is a second light beam, parts of areas located inside an effective diameter of the second light beam and areas located outside the same to which the same voltage is applied for compensating for a spherical aberration generated in the first light beam are connected electrically to be the same potential.
Description
Technical field
The present invention relates to a kind of optical take-up apparatus, it is used for by reproducing and recorded information on this optical recording media towards the optical recording media projecting beam.Especially, the present invention relates to a kind of small size and optical take-up apparatus cheaply, it has the liquid crystal cell that is used for the compensated wave aberration.
Background technology
In recent years, become very common such as the optical recording media of compact disk (hereinafter being called CD) or digital multi-purpose CD (hereinafter being called DVD) and be widely used.In addition, in order to increase the quantity of information that is recorded on the optical recording media, now the high density of optical recording media is studied.For example, can utilize high-density optic recording medium such as HD-DVD or Blu-ray Disc (registered trademark hereinafter is called BD) and so on as high-quality DVD.
When reproduction or recorded information on optical recording media, thereby optical take-up apparatus is used for towards optical recording media projecting beam record or information reproduction.This optical take-up apparatus comprises object lens with suitable numerical aperture (NA) and the light source with the suitable wavelength that conforms to the type of optical recording media.For example, the NA that is used for the object lens of CD is 0.50, and the wavelength that is used for the light source of CD is 780nm.The NA that is used for the object lens of DVD is 0.65, and the wavelength that is used for the light source of DVD is 650nm.The NA that is used for the object lens of HD-DVD is 0.65, and the wavelength that is used for the light source of HD-DVD is 405nm.The NA that is used for the object lens of BD is 0.85, and the wavelength that is used for the light source of BD is 405nm.
Because as mentioned above, the NA of object lens and wavelength change according to the type of optical recording media, and therefore different optical take-up apparatus can be used to different optical recording medias.Yet if single optical take-up apparatus can read or write down the information on polytype optical recording media, this will be very easily.This optical take-up apparatus been has has been researched and developed in large quantities.Wherein, for example disclose a kind of optical take-up apparatus among the JP-A-2005-71424, used single object lens to reproduce in this optical take-up apparatus and write down information on polytype optical recording media.
When using single object lens to support polytype optical recording media, for example, even adjust in the optical recording media that object lens make a type and do not produce spherical aberration, when reproducing on the optical recording media in other types or during recorded information, also may producing spherical aberration.Therefore, described in JP-A-2005-71424, liquid crystal panel is set in optical take-up apparatus usually, and controls the voltage that is applied on this liquid crystal panel, thus compensating for spherical aberration.For example, in JP-A-2005-71424 and other many pieces of documents, described for this purpose and the liquid crystal panel of the following type that is provided with.In the type, the transparency electrode that constitutes liquid crystal panel is divided into a plurality of zones with concentric manner, thereby and control be applied to voltage compensating for spherical aberration on these zones.
Yet, when using above-mentioned liquid crystal panel, must increase transparency electrode concentric regions cut apart number to compensate the aberration that polytype optical recording media is produced.Therefore, the number of electrodes and wiring (wiring connection) quantity that are arranged on the circuit board that is used to control liquid crystal panel increase, thereby the size of optical take-up apparatus and manufacturing cost increase.Consider this point, can undercompensation be used for the aberration of polytype optical recording media but aberration for compensation substantially, thereby the number of electrodes that is arranged on the circuit board can be reduced to some, but this quantity reduces and has limitation.
In addition, as shown in JP-A-2005-71424, by using the sectional type liquid crystal panel or by using classification type liquid crystal panel to reduce to be arranged on number of electrodes and the wiring quantity on the circuit board that is used to control this liquid crystal panel, wherein, this sectional type liquid crystal panel comprises a plurality of with the low-impedance transparency electrode of having of concentric manner setting, and has by the adjacent electrode connected to one another with the impedor of transparency electrode same material; And this classification type liquid crystal panel have on a plurality of transparency electrodes that are positioned at the high impedance of not cutting apart, have a low-impedance coaxal electrode.Yet under the situation that adopts this structure, at first the structure of this liquid crystal panel will become complicated, and in addition, the manufacturing cost of liquid crystal panel also will increase.
Summary of the invention
The object of the present invention is to provide a kind of optical take-up apparatus, it can read and recorded information on polytype optical recording media, and comprise the liquid crystal cell that is used for compensating for spherical aberration, this optical take-up apparatus can reduce the number of electrodes that is arranged on the circuit board that is used to control liquid crystal cell, and reduce wiring quantity, to reduce this device size and to reduce manufacturing cost.
Optical take-up apparatus according to the present invention comprises: light source; Collector lens, it will be from the beam convergence of this light emitted to the recording surface of optical recording media; And liquid crystal cell, it is arranged between this light source and this collector lens, and a plurality of transparency electrodes that have liquid crystal and be used to insert and put this liquid crystal.At least one transparency electrode in described a plurality of transparency electrode is divided into a plurality of zones with concentric manner.Adjustment is applied to each the regional voltage in described a plurality of zone, so that this liquid crystal cell compensates the spherical aberration that produces in two light beams with different effective diameters on this collector lens.Suppose that the light beam that has big effective diameter value in described two light beams is first light beam, another light beam with less diameter value is second light beam, the spherical aberration that produces in this first light beam is first spherical aberration, and the spherical aberration that produces in this second light beam is second spherical aberration.Thereby, if identical voltage can be applied in described a plurality of zones interior zone and perimeter during this first spherical aberration, then be electrically connected this interior zone and this perimeter to have identical electromotive force with respect to the effective diameter of this second light beam in compensation.Here, " effective diameter " is the notion of the diameter of expression collector lens, and this collector lens is used for the hot spot that forms on the optical recording media is carried out imaging so that reproduce and recorded information.Below describe the same.
According to this structure, optical take-up apparatus comprises liquid crystal cell, and this liquid crystal cell has the transparency electrode that is divided into a plurality of zones with concentric manner, thereby can compensate the spherical aberration that produces in two light beams with different effective diameters.Have identical electromotive force owing to some zones in a plurality of zones that form with concentric manner are electrically connected, therefore be arranged on number of electrodes on the circuit board that is used to control liquid crystal cell and can be reduced to quantity less than the zone that forms on the transparency electrode.Like this, also can reduce the wiring quantity that is arranged on the circuit board that is used to control liquid crystal cell, thereby can reduce the size and the cost of optical take-up apparatus.
In addition, according to the present invention, in having the optical take-up apparatus of said structure, when reference zone R is applied in constant voltage to comprise at least one zone of the maximal value part of this first spherical aberration with compensation, the R-n zone in a plurality of zones is n (n=1,2 that inwardly are provided with from this reference zone R, ...) zone, and the R+n zone be n of outwards being provided with from this reference zone R (n=1,2 ...) and the zone.Thereby, form described a plurality of zone, being applied to voltage on described a plurality of zone by control, make this R-n zone have identical magnitude of voltage with this R+n zone, compensate this first spherical aberration, and can compensate this second spherical aberration by desirable voltage being applied to each zone of the effective diameter inside that is positioned at this second light beam.
According to this structure, owing to determine to be formed on the pattern in a plurality of zones on the transparency electrode, increase so that have the quantity of the connection group of same potential by electrical connection, therefore can fully reduce the number of electrodes and the wiring quantity that are arranged on the circuit board that is used to control liquid crystal cell, thereby reduce the size of this optical take-up apparatus.
In addition, according to the present invention, in having the optical take-up apparatus of said structure, this light source has two or three different wavelength, and adjust this collector lens so that be different from the approximate vanishing of spherical aberration of another light beam of described two light beams, the wavelength of described another light beam is the shortest from the light of this light emitted, and effective diameter value maximum.
Therefore according to this structure,, can simplify the structure of liquid crystal cell relatively owing to design object lens in advance so that aberration compensation can not produce aberration in the light beam of difficulty relatively.
In addition, according to the present invention, in having the optical take-up apparatus of said structure, the described electrode that is used for powering be not arranged on described a plurality of zones with lower area, promptly, be used to compensate the magnitude of voltage that this first spherical aberration and this second spherical aberration applied and be zero zone, and to be positioned at the effective diameter outside of this second light beam and to be used to compensate magnitude of voltage that this first spherical aberration applied be zero zone.
According to this structure, can further reduce the number of electrodes that is arranged on the circuit board that is used to control liquid crystal cell.
Description of drawings
Fig. 1 is the synoptic diagram that illustrates according to the optical system structure of the optical take-up apparatus of present embodiment;
Fig. 2 is the schematic cross-section that is arranged at the liquid crystal cell in the optical take-up apparatus of present embodiment;
Fig. 3 illustrates the synoptic diagram that is formed at according to the pattern on the transparency electrode of the liquid crystal cell of present embodiment;
Fig. 4 illustrates at a distance of in the distance at the center of the transparency electrode of cutting apart with concentric manner and from being used for CD and being used for the curve map of the relation between the spherical aberration that the light beam of the light emitted of DVD produces;
Fig. 5 is the form that illustrates about the data in a plurality of zones on the transparency electrode that is formed on liquid crystal cell;
Fig. 6 is the curve map that illustrates by the state of the spherical aberration that produces from the light beam of the light emitted that is used for CD according to the compensation of the liquid crystal cell of present embodiment; And
Fig. 7 is the curve map that illustrates by the state of the spherical aberration that produces from the light beam of the light emitted that is used for DVD according to the compensation of the liquid crystal cell of present embodiment.
Embodiment
Referring now to appended accompanying drawing embodiments of the invention are described.At the embodiment shown in this only is example, so the present invention is not limited at the embodiment shown in this.
Fig. 1 is the synoptic diagram that illustrates according to the optical system structure of the optical take-up apparatus of present embodiment.In Fig. 1, Reference numeral 1 expression optical take-up apparatus, it can be by coming the information of reading and recording on the recording surface 9a of the optical recording media 9 that comprises three types of CD, DVD and BD towards optical recording media 9 projecting beams and the light that receives its emission, and by towards optical recording media 9 projecting beams writing information on recording surface 9a.The optical system of this optical take-up apparatus 1 comprises light source 2, optical splitter 3, collimating mirror 4, completely reflecting mirror 5, liquid crystal cell 6, object lens 7 and photodetector 8.Below will describe these optical elements in detail.
The light beam that collimating mirror 4 will pass optical splitter 3 is converted into directional light.The directional light that has passed collimating mirror 4 is transmitted into completely reflecting mirror 5.
Completely reflecting mirror 5 total reflections are as the light beam that passes the directional light of collimating mirror 4, and the optical axis of this light beam is perpendicular to the recording surface 9a of optical recording media 9.Be noted that completely reflecting mirror 5 is with respect to from 45 ° of the inclined light shafts of light source 2 emitted light beams.Be emitted to liquid crystal cell 6 by completely reflecting mirror 5 beam reflected.
Object lens (collector lens) 7 will pass the beam convergence of liquid crystal cell 6 to the recording surface 9a of optical recording media 9.Object lens 7 in the present embodiment are designed to make and can produce spherical aberration from the light beam of the light emitted that is used for BD.Be noted that in the present embodiment, liquid crystal cell 6 and object lens 7 are installed on the actuator (not shown) of object lens.Formation in this way can prevent to move the coma aberration that produces owing to the optical axis of object lens 7 and liquid crystal cell 6.Yet, always do not need liquid crystal cell 6 is installed on the actuator of object lens, also can use other structure.
Next the detailed structure that is arranged at the liquid crystal cell 6 on the optical take-up apparatus 1 according to present embodiment will be described.Fig. 2 is the schematic cross-section that is arranged at the liquid crystal cell 6 in the optical take-up apparatus 1 of present embodiment.As shown in Figure 2, liquid crystal cell 6 forms in the following manner: liquid crystal 10 is clipped between two transparency electrode 11a positioned opposite to each other and the 11b, and the outside surface with transparency electrode 11a and 11b is clipped between glass plate 12a and the 12b at the position that is formed with transparency electrode 11a and 11b and liquid crystal 10.
Fig. 3 illustrates the synoptic diagram that transparency electrode 11a goes up the pattern that forms.As shown in Figure 3, liquid crystal cell 6 transparency electrode 11a forms and is divided into a plurality of patterns of regional 13 with concentric manner.On the other hand, another transparency electrode 11b is not cut apart but is formed single electrode (ordinary electrode).Although in the present embodiment, electrode among transparency electrode 11a and the 11b forms the electrode of cutting apart and another electrode is not cut apart,, present embodiment is not limited thereto.Also can on two transparency electrode 11a and 11b, all form the pattern of cutting apart.
Yet, if being, two transparency electrode 11a and 11b cut apart electrode, may increase and be used for power necessary number of electrodes and wiring quantity to transparency electrode 11a and 11b.Therefore, for avoiding the increase of plant bulk, preferably, among two transparency electrode 11a and the 11b only electrode cut apart and another is an ordinary electrode.
In this case, must all compensate with the spherical aberration that the light beam that is used for DVD produces being used for CD.Even for can be not exclusively but also can suitably compensate these two kinds of spherical aberrations to a certain extent, will be increased to some by the quantity of cutting apart the zone 13 that transparency electrode 11a forms.Yet if increased the quantity of cutting apart transparency electrode 11a as mentioned above, the number of electrodes and the wiring quantity that are arranged on the circuit board (not shown) that is used to control liquid crystal cell 6 also will increase, thereby the size of circuit board and optical take-up apparatus 1 also will increase.
Consider this point, in the present embodiment, determine the pattern in zone 13 so that the number of electrodes and the wiring quantity that are arranged on the circuit board that is used to control liquid crystal cell 6 can reduce.Be used for CD and have different effective diameters with the light beam that is used for DVD.More specifically, as shown in Figure 3, be used for effective diameter (effective diameter of first light beam) 15 the effective diameters (effective diameter of second light beam) 14 of the light beam of DVD greater than the light beam that is used for CD.Therefore, narrower by the phase range of liquid crystal control under the situation of CD when compensating for spherical aberration, and the phase range broad of under the situation of DVD, controlling by liquid crystal.
Therefore, for the zone that is used for compensating for spherical aberration under the situation of CD and DVD, promptly be arranged in the zone (corresponding to the regional 13a-13h of present embodiment) of effective diameter 14 inside of CD, need adjust each regional voltage respectively, thereby but under the situation of CD and DVD equal compensating for spherical aberration.Yet,, only need adjust voltage with compensating for spherical aberration under the situation of DVD only for the zone (corresponding to the regional 13i-13n in the present embodiment) of effective diameter 14 outsides.
Therefore, the zone of effective diameter 14 outsides can be electrically connected to have identical electromotive force with the interior zone that is applied in identical voltage, wherein the zone of these effective diameter 14 outsides can be applied in the regional identical voltage of effective diameter 14 inside and be used for the spherical aberration that the light beam of DVD produces with compensation.Like this, single electrode is enough to these block supplies that are connected to same potential.Therefore, can reduce the number of electrodes that is arranged on the circuit board that is used to control liquid crystal cell 6.
Consider this point, in the present embodiment, the pattern of determining zone 13 to be to have the quantity that is connected group of identical voltage in the interior zone that is increased in effective diameter 14 and the perimeter, applies above-mentioned voltage and is used for the spherical aberration that the light beam of DVD produces with compensation.More specifically, suppose in zone 13, the spherical aberration that the light beam that is used for DVD is produced is that to apply constant voltage be reference zone R (corresponding to regional 13g and the 13h in the present embodiment) with the zone that compensates this spherical aberration to peaked part, the R-n zone is the n (n=1 that inwardly is provided with from reference zone R, 2 ...) individual zone, and the R+n zone is the n (n=1 that outwards is provided with from reference zone R, 2 ...) individual zone.Then, apply voltage so that the R-n zone has identical voltage with the R+n zone.
Then, as mentioned above, be applied at voltage and simulate under 13 the prerequisite of zone to determine the pattern in zone 13, thereby be used in the spherical aberration that produces in the light beam of DVD and become minimum value, that is, farthest be similar to the opposite distributed wave of phase place of the spherical aberration distribution that produces with the light beam that is used for DVD.Yet do not consider in this case, the compensation of the spherical aberration that the light beam that is used for CD is produced fully.Therefore, may there be the situation that can not compensate the spherical aberration that the light beam that is used for CD produces.
Therefore, based on the zone map that is used for DVD that obtains by simulation, the spherical aberration that need simulate to produce in the light beam that is used in CD also can be compensated.In the present embodiment, even by the above-mentioned zone map that is used for DVD that obtains by simulation, adjust the phase place of each region generating of effective diameter 14 inside of the light beam that is used for CD, can not suitably compensate the spherical aberration that the light beam that is used for CD produces.Therefore this does not need to be divided into two zones and is divided into two zones (regional 13g and 13h) with the reference zone R that compensation is used for the spherical aberration that the light beam of DVD produces.
Like this, for being formed on a plurality of regional 13 on the transparency electrode 11a, under the prerequisite that keeps identical voltage is applied to the spherical aberration that the regional and R+n zone of R-n is used for DVD with compensation light beam produces, by desirable voltage being applied to each the regional 13a-13h that is positioned at effective diameter 14 inside, realize compensating the structure of the spherical aberration that the light beam that is used for CD produces.
Be noted that in the present embodiment, because the zone map that is used for DVD that obtains by simulation can not suitably compensate the spherical aberration that the light beam that is used for CD produces, thereby reference zone R is split into two zones.Yet the present invention is not limited to this structure.Also can be according to because the amount of the spherical aberration that the structure of optical system etc. produce, to make reference zone R be single zone or it is divided into three or more zones.
Fig. 5 is the form that illustrates about the numeric data of regional 13a-13n.Here, concentrically ringed radius region shows concentrically ringed internal diameter and the external diameter around each regional 13a-13n.The liquid crystal cell 6 that has as mentioned above a concentric regions 13a-13n that forms by use compensates the result of the spherical aberration that the light beam that is used for CD and is used for DVD produces shown in Fig. 6 and Fig. 7.In Fig. 6 and Fig. 7, residual error is meant when by liquid crystal cell 6 being applied the phase pattern (phase pattern after the compensation) that stays when phase pattern that voltage produces is added to the phase pattern of spherical aberration.If the pattern of residual error is less than quarter-wave, then spherical aberration has suitably been compensated.
Be noted that as if the phase place that produces be not enough in the compensation image 7 spherical aberration that should the zone produces between the liquid crystal radius 1.1-1.5mm of liquid crystal cell 6.Even this is because consider wavelength of phase shifts, in phase compensation, also can obtains identical effect, thereby phase place (is moved-1.05 wavelength from wavelength of the original phase shifts that should produce among regional 13f and 13i; In regional 13g and 13h, move-1.1 wavelength).In this way, the maximal value that drives 6 voltages that must apply of liquid crystal cell can be reduced, thereby the load of optical take-up apparatus 1 can be reduced.
As mentioned above, can suitably compensate the spherical aberration that the light beam that is used for CD and is used for DVD produces according to the optical take-up apparatus 1 of present embodiment.In addition, the number of electrodes that is arranged on the circuit board that is used for controlling liquid crystal cell 6 can reduce six from 14, promptly reduce to eight, wherein liquid crystal cell 6 is actuated to compensating for spherical aberration, and wherein 14 be the quantity of the regional 13a-13n that when the transparency electrode 11a of liquid crystal cell 6 is cut apart (Fig. 3 and Fig. 5), obtained.More specifically, regional 13a is electrically connected to each other to have identical electromotive force with 13i with 13m, regional 13c and 131, regional 13d and 13k, regional 13e and 13j and regional 13f with 13n, regional 13b.
In this case, not only can reduce the number of electrodes on the circuit board that is used to control liquid crystal cell 6, but also can reduce wiring quantity.Therefore, can reduce to be used to control the size of the circuit board of liquid crystal cell 6, thereby can realize undersized optical take-up apparatus 1.In Fig. 3, Reference numeral 16 expression wiring, and in the numeral shown in the end of each wiring corresponding to the electrode numbering that is arranged on the circuit board that is used to control liquid crystal cell 6.
A plurality of structures of regional 13 (size and the quantity in zone) are not limited to the said structure of present embodiment.Can in the scope of purpose of the present invention, carry out various modification to this structure.For example, in the present embodiment, when compensation is used for spherical aberration that the light beam of DVD produces, identical voltage is applied to R-n (n=1,2,3,4,5 and 6) zone and the regional (see figure 5) of R+n (n=1,2,3,4,5 and 6).Yet, for the value of said n, also identical voltage can be applied to the zone of n=1 to n=3, and identical voltage be applied to the zone of n=4 to n=6.
But, in order to reduce the required number of electrodes of circuit board that is used to control liquid crystal cell 6 as much as possible, preferably, constitute zone 13 and apply the quantity in the zone of identical voltage with increase, thus the spherical aberration that can produce at the interior zone of the effective diameter 14 of the light beam that is used for CD and light beam that the perimeter compensation is used for DVD.
In addition, in the present embodiment, zone 13a and the regional 13n that is positioned at effective diameter 14 outsides of the light beam that is used for CD are connected to the electrode of the circuit board that is used to control liquid crystal cell 6, wherein, the compensation that the zone is applied among the 13a is used for CD and is used for the voltage vanishing of the spherical aberration that the light beam of DVD produces, and the compensation that is applied among the regional 13n is used for the also vanishing of voltage of the spherical aberration that the light beam of DVD produces.Yet, also can adopt following structure, wherein electrode not corresponding region 13a and 13n be provided with, and regional 13a and 13n are not connected to the circuit board that is used to control liquid crystal cell 6 yet.In this way, can further reduce necessary number of electrodes of circuit board and the wiring quantity that is used to control liquid crystal cell 6.
In addition, the object lens 7 of the optical take-up apparatus 1 of design in the present embodiment not to be can producing spherical aberration in the light beam that is used in BD, and are used for CD and are used for the spherical aberration that the light beam of DVD produces and can compensate by liquid crystal cell 6.Yet the present invention is not limited to this structure.For example, can adopt following structure, that is, design object lens 7 not to be can producing spherical aberration in the light beam that is used in DVD yet, and are used for CD and are used for the spherical aberration that the light beam of BD produces and can compensate by liquid crystal cell 6.
In addition, as the optical take-up apparatus 1 of present embodiment, the structure of the optical take-up apparatus of supporting to comprise CD, DVD, these three kinds of optical recording medias of BD has been described.Yet practical range of the present invention is not limited thereto, and it can carry out various modification in the scope of purpose of the present invention.For example, also can adopt following structure, promptly support to comprise CD, DVD, these three kinds of optical recording medias of HD-DVD, and design object lens 7 not to be can producing spherical aberration in the light beam that is used in HD-DVD, and are used for CD and are used for the spherical aberration that the light beam of DVD produces and can compensate by liquid crystal cell 6.Can adopt following structure equally, promptly support to comprise BD, HD-DVD, these three kinds of optical recording medias of CD, and design object lens 7 not to be can producing spherical aberration in the light beam that is used in BD, and are used for CD and are used for the spherical aberration that the light beam of HD-DVD produces and can compensate by liquid crystal cell 6.
In addition, also can adopt following structure, promptly support to comprise DVD and these two kinds of optical recording medias of BD, and do not adjust object lens 7, all can not producing spherical aberration in the light beam that is used in any optical recording media, and be used for DVD and be used for the spherical aberration that the light beam of BD produces and to compensate by liquid crystal cell 6.
According to optical take-up apparatus of the present invention, it can reduce the number of electrodes that is arranged on the liquid crystal cell, is used for compensating for spherical aberration.Therefore, wiring quantity and number of electrodes on the circuit board that is used to control liquid crystal cell can be reduced, thereby the size of circuit board can be reduced.Therefore, can realize small size and optical take-up apparatus cheaply.
Claims (8)
1. optical take-up apparatus, it comprises:
Light source;
Collector lens, it will be from the beam convergence of this light emitted to the recording surface of optical recording media; And
Liquid crystal cell, it comprises liquid crystal and a plurality of transparency electrodes that are provided with in the mode that inserts and puts this liquid crystal, this liquid crystal cell is arranged between this light source and this collector lens, wherein:
At least one transparency electrode in a plurality of transparency electrodes of this liquid crystal cell is divided into a plurality of zones with concentric manner;
Be applied to each the regional voltage in a plurality of zones of this liquid crystal cell by adjustment, this liquid crystal cell compensated have the spherical aberration that produces in two light beams of different effective diameters on this collector lens; And
The light beam that has big effective diameter value in described two light beams is first light beam, another light beam with less effective diameter value is second light beam, and when the spherical aberration that produces in this first light beam and this second light beam is respectively first spherical aberration and second spherical aberration, if identical voltage can be applied in described a plurality of zones interior zone and perimeter during this first spherical aberration, then be electrically connected this interior zone and this perimeter to have identical electromotive force with respect to the effective diameter of this second light beam in compensation.
2. optical take-up apparatus according to claim 1, wherein, when reference zone R is applied in constant voltage comprises the maximal value part of this first spherical aberration with compensation at least one zone, R-n zone in a plurality of zones is n the zone that inwardly is provided with from this reference zone R, and the R+n zone is that n of outwards being provided with from this reference zone R is when regional, n=1 wherein, 2, ..., form described a plurality of zone, being applied to voltage on described a plurality of zone by control, make this R-n zone have identical magnitude of voltage with this R+n zone, compensate this first spherical aberration, and can compensate this second spherical aberration by desirable voltage being applied to each zone of the effective diameter inside that is positioned at this second light beam.
3. optical take-up apparatus according to claim 1, wherein, this light source has two or three different wavelength, and adjust this collector lens so that be different from the approximate vanishing of spherical aberration of another light beam of described two light beams, the wavelength of described another light beam is the shortest from the light of this light emitted, and effective diameter value maximum.
4. optical take-up apparatus according to claim 1, wherein, the described electrode that is used for powering be not arranged on described a plurality of zones with lower area, promptly, be used to compensate the magnitude of voltage that this first spherical aberration and this second spherical aberration applied and be zero zone, and to be positioned at the effective diameter outside of this second light beam and to be used to compensate magnitude of voltage that this first spherical aberration applied be zero zone.
5. optical take-up apparatus according to claim 2, wherein, this light source has two or three different wavelength, and adjust this collector lens so that be different from the approximate vanishing of spherical aberration of another light beam of described two light beams, the wavelength of described another light beam is the shortest from the light of this light emitted, and effective diameter value maximum.
6. optical take-up apparatus according to claim 2, wherein, the described electrode that is used for powering be not arranged on described a plurality of zones with lower area, promptly, be used to compensate the magnitude of voltage that this first spherical aberration and this second spherical aberration applied and be zero zone, and to be positioned at the effective diameter outside of this second light beam and to be used to compensate magnitude of voltage that this first spherical aberration applied be zero zone.
7. optical take-up apparatus according to claim 3, wherein, the described electrode that is used for powering be not arranged on described a plurality of zones with lower area, promptly, be used to compensate the magnitude of voltage that this first spherical aberration and this second spherical aberration applied and be zero zone, and to be positioned at the effective diameter outside of this second light beam and to be used to compensate magnitude of voltage that this first spherical aberration applied be zero zone.
8. optical take-up apparatus according to claim 5, wherein, the described electrode that is used for powering be not arranged on described a plurality of zones with lower area, promptly, be used to compensate the magnitude of voltage that this first spherical aberration and this second spherical aberration applied and be zero zone, and to be positioned at the effective diameter outside of this second light beam and to be used to compensate magnitude of voltage that this first spherical aberration applied be zero zone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005360799A JP4609301B2 (en) | 2005-12-14 | 2005-12-14 | Optical pickup device |
| JP2005360799 | 2005-12-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1983411A true CN1983411A (en) | 2007-06-20 |
| CN100492506C CN100492506C (en) | 2009-05-27 |
Family
ID=38139161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101642843A Expired - Fee Related CN100492506C (en) | 2005-12-14 | 2006-12-08 | Optical pickup device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7724632B2 (en) |
| JP (1) | JP4609301B2 (en) |
| KR (1) | KR101215799B1 (en) |
| CN (1) | CN100492506C (en) |
| DE (1) | DE102006059121A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4484814B2 (en) | 2005-12-26 | 2010-06-16 | 株式会社日立メディアエレクトロニクス | Aberration correction apparatus and optical pickup including the same |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100206771B1 (en) | 1995-12-29 | 1999-07-01 | 구자홍 | Optical pickup device |
| DE69722951T2 (en) | 1996-10-31 | 2004-05-19 | Sanyo Electric Co., Ltd., Moriguchi | OPTICAL SCANNER |
| US6625102B1 (en) | 1999-03-15 | 2003-09-23 | Citizen Watch Co., Ltd. | Optical device |
| KR100740481B1 (en) * | 1999-09-02 | 2007-07-19 | 아사히 가라스 가부시키가이샤 | Optical head |
| JP3781262B2 (en) * | 2000-03-28 | 2006-05-31 | パイオニア株式会社 | Aberration correction apparatus and driving method thereof |
| EP1560209B1 (en) | 2002-11-08 | 2012-04-11 | Citizen Holdings Co., Ltd. | Liquid crystal optical element and optical device |
| JP3835402B2 (en) * | 2002-11-19 | 2006-10-18 | 株式会社日立製作所 | Information reproducing method and information reproducing apparatus for multilayer optical disk |
| JP2005071424A (en) * | 2003-08-28 | 2005-03-17 | Pioneer Electronic Corp | Aberration correcting device and optical recording medium playback device |
| JPWO2005074388A1 (en) | 2004-02-09 | 2007-09-13 | コニカミノルタオプト株式会社 | Optical pickup device and optical information recording and / or reproducing device |
| JP4300138B2 (en) * | 2004-03-09 | 2009-07-22 | パイオニア株式会社 | Aberration correction device, optical pickup control device, control method, and control program |
| KR20050117844A (en) | 2004-06-11 | 2005-12-15 | 삼성전자주식회사 | Pick-up device for beam |
| KR100541954B1 (en) | 2004-06-11 | 2006-01-12 | 삼성전자주식회사 | Pick-up device for beam |
| JP4399324B2 (en) * | 2004-07-09 | 2010-01-13 | パイオニア株式会社 | Aberration correction device, optical pickup control device, control method, and control program |
-
2005
- 2005-12-14 JP JP2005360799A patent/JP4609301B2/en not_active Expired - Fee Related
-
2006
- 2006-12-08 CN CNB2006101642843A patent/CN100492506C/en not_active Expired - Fee Related
- 2006-12-13 US US11/637,817 patent/US7724632B2/en not_active Expired - Fee Related
- 2006-12-14 KR KR1020060127920A patent/KR101215799B1/en not_active IP Right Cessation
- 2006-12-14 DE DE102006059121A patent/DE102006059121A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| US7724632B2 (en) | 2010-05-25 |
| JP4609301B2 (en) | 2011-01-12 |
| JP2007164907A (en) | 2007-06-28 |
| CN100492506C (en) | 2009-05-27 |
| KR101215799B1 (en) | 2012-12-26 |
| KR20070063459A (en) | 2007-06-19 |
| US20070133373A1 (en) | 2007-06-14 |
| DE102006059121A1 (en) | 2007-07-19 |
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